Holocene wet shifts in NW European bogs: evidence for the roles of external forcing and internal feedback from a high‐resolution study of peat properties, plant macrofossils and testate amoebae

Rundgren, Mats; Kokfelt, Ulla; Schoning, Kristian; Wastegård, Stefan

doi:10.1002/jqs.3485

Cited by 4 publications

(1 citation statement)

References 72 publications

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“…This was followed by colder and drier conditions until ∼1,500 years BP, after which the climate was wet and cold (Wastegård, 2022). Reports of a wet shift in mire hydrology (Rundgren et al, 2023) and increasing vertical peat accumulation rates (Larsson et al, 2017) have been reported from this period. Wetter and more suitable periods of Holocene climatic conditions may have enhanced the mire expansion patterns observed for the SMC.…”

Section: Uncertainties In the Description Of Temporal Patterns In Mir...mentioning

confidence: 99%

Topography and Time Shape Mire Morphometry and Large‐Scale Mire Distribution Patterns in the Northern Boreal Landscape

Ehnvall,

Ratcliffe,

Nilsson

et al. 2024

JGR Earth Surface

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Peatlands are major terrestrial soil carbon stores, and open mires in boreal landscapes hold a considerable fraction of the global peat carbon. Despite decades of study, large‐scale spatiotemporal analyses of mire arrangement have been scarce, which has limited our ability to scale‐up mire properties, such as carbon accumulation to the landscape level. Here, we use a land‐uplift mire chronosequence in northern Sweden spanning 9,000 years to quantify controls on mire distribution patterns. Our objectives include assessing changes in the spatial arrangement of mires with land surface age, and understanding modifications by upland hydrotopography. Characterizing over 3,000 mires along a 30 km transect, we found that the time since land emergence from the sea was the dominant control over mire coverage, especially for the establishment of large mire complexes. Mires at the youngest end of the chronosequence were small with heterogenous morphometry (shape, slope, and catchment‐to‐mire areal ratios), while mires on the oldest surfaces were variable in size, but included larger mires with more complex shapes and smaller catchment‐to‐mire ratios. In general, complex topography fragmented mires by constraining the lateral expansion, resulting in a greater number of mires, but reduced total mire area regardless of landscape age. Mires in this study area occurred on slopes up to 4%, indicating a hydrological boundary to peatland expansion under local climatic conditions. The consistency in mire responses to spatiotemporal controls illustrates how temporal limitation in peat initiation and accumulation, and topographic constraints to mire expansion together have shaped present day mire distribution patterns.

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Section: Uncertainties In the Description Of Temporal Patterns In Mir...mentioning

confidence: 99%